| 1. | Night descends quickly in the tropics .
热带地区黑夜来得很快。 |
| 2. | Termites are principally tropical in distribution .
白蚁主要分布在热带地区。 |
| 3. | Darkness falls quickly in the tropics .
热带地区天黑得很快。 |
| 4. | Sometimes two crops a year are taken in the humid tropics .
在湿润的热带地区有时一年种两季作物。 |
| 5. | A much greater structural risk occurs in temperate and tropical areas .
在温带和热带地区会出现更大的结构风险。 |
| 6. | These systems appear ecologically well adapted to the humid tropics .
这些系统对于潮湿热带地区表现良好的生态适应。 |
| 7. | This reflect our ignorance of tropical regions and the need for intensive research in this area .
这说明我们对热带地区不重视，需要对该地区加强研究。 |
| 8. | In tropical areas, larger plots have proved more useful due to greater heterogeneity of the forest .
在热带地区，由于森林的异质性较大，已证实大一些的样地更有效。 |
| 9. | Only in the tropics were numerous late cretaceous groups extinguished during peaks in their evolution .
只是热带地区才有大批晚白垩纪生物类群正值其演化的极盛时期突然消亡。 |
| 10. | When cultivated and stripped of their dense vegetative cover, soils of the humid tropics quickly lose their fertility .
当将厚密的植被除去并耕种时，潮湿热带地区的土壤就会迅速失去其肥力。 |
